package com.func.boom.utils;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.digest.MD5;
import com.func.boom.utils.jwt.JwtHelper;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import sun.misc.BASE64Encoder;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * @author Yulei
 * @date 2020-09-11 10:05:08
 * @desc
 */
@Slf4j
public class CommonUtil {

    /**
     * MD5
     * @param param
     * @return
     */
    public static String md5(String param) {
        try {
            BASE64Encoder baseEncoder = new BASE64Encoder();
            MD5 md5 = MD5.create();
            return baseEncoder.encode(md5.digest(param.getBytes(CharsetUtil.UTF_8)));
        } catch (Exception e) {
            log.error("MD5加密异常： {}", e.getMessage());
        }
        return null;
    }

    /**
     * 获取ip
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress="";
        }
        // ipAddress = this.getRequest().getRemoteAddr();

        return ipAddress;
    }

    /**
     * 获取当前登录用户id
     * @param request
     * @return
     */
    public static Integer getUserId(HttpServletRequest request){
        String token = request.getHeader("token");
        if (StrUtil.equals(token, "")) {
            return null;
        }
        Claims claims = JwtHelper.parseJWT(token);
        return Convert.toInt(claims.get("userId"));
    }

}
